Ayare steam



x UNITED i STATES PATENT OEEICE.

` AMESDIMELOW, OE VILMINGTON, DELAVARE, ASSIGNOR TO THE DELA- VARE STEAM APPLIANOE COMPANY, OF SAME PLACE.

INJECTOR.

SPECIFICATION forming part of Letters Patent No. 280,589, dated July 3, 1883. Application filed February 26, 1883. (Model.)

To @ZZ whom it may concern:

Be it known that I, JAMES DIMELoW, a subject. of the Queen of Great Britain and Ireland, and a resident of Vilmington, Delaware, have invented certain Improvements in Injectors,

of which the following is a specification.

The objects of my invention are to simplify the construction of the injector, and to dispense with a valve for preventing drip from 1o the overflow-tube when the injector is in action. These lobjects I attain in the manner which I will now proceed to describe, reference being had to the accompanying drawings, in which# y Figure l is a longitudinal section of an injector with my improvements; Fig. 2, a sectional plan of' the same on the line 1 2; Figs. 3 and 4, views illustrating modifications of the invention.

In Figs. l and 2, A is the main shell or casing of the injector, having the usual waterchaniber, B, with branch B, overilow-chamber D, with branch D', andcombining-tube E, conv nected to the shell by the partition E and sepa- 2 5 rating the two chambers. E is the steam-cone, and G the forcing-cone, the steam and water passages of which may be constructed in any suitable manner. In each end of the casing is formed a tapering seat, a, that at one end of 3o the casing being adapted for the reception of the steam-cone Fand that at the opposite end for the reception of the forcing-cone G, each seat and the exterior of each cone being rendered perfectly true by grinding or otherwise, so that a steam or water tight joint will be formed when the cones are forced into their seats. This coniinementof the cones to the seats is effected by means of nuts J, adapted to the threaded branches of the casingy A, and 4o having iianges b bearing against shoulders d on the cones. Each cone has a threaded projection, f, whereby connections can be made to the steam and discharge pipes, the usual independent couplings for this piurpose being dispensed with. V

2 In Fig. 3 I have shown a modification ofthe invention in whichhe seat in the end of the casing is adapted for the reception of a flange on the steam-cone, a portion of the body of 5o the latter in this case being cylindrical.

In the overfiow branch D of the injector is aplug, M, whereby the discharge-passage of said branch is contracted at x, the passage iiaringontwardly from this point to the bottom or discharge end. The passage also fiares from the contracted portion n: to the inner end of the plug M; but this iiare serves simply to direct the water to the point x, and is not essential, for the plug may be made as shown in Fig. 4, and yet attain the main object of this feature of my invention, which is to prevent the dripping of water from the overflow branch when the injector is in action, and yet permit a free flow of water from said branch before the flow through the injector has been established. Ordinarily a valve is used for this purpose, the valve being opened by the pressure of water in the first instance, but being closed by a light spring as soon as the flow through the injector begins. This dischargepassage I make on the principle of the vena contracte, or, as it is sometimes termed, aju- ,tage, (see Knights Dictionary, Vpage that is to say, the passage flares at a certain angle outwardly from the contracted point x. It is well known that a passage of this shape will discharge water or other liquid 'more rapidly than a simple vopening of the diameter 0f the portion m, or than a uniform passage of the same diameter; but by applying the principle to the overflow-passage of aninj ector I attain a double resultwthat is to say, I am enabled, without the use of a valve, to provide for a free flow of water from the overiiow-chamber prior to the starting of the injector, and yet prevent thc dripping of water after the injector has been started, for the aperture a' can be of such limited area that the inflow of air through the same will be sufficient to prevent the escape of any water from the chamber D. A passage of the desired form may be made directly Vin the overflow branch D', but the use of the plug M is preferred in all cases as the readiest means of forming the contracted passage.

I claim as my invention- 1. The shell or casing A, having the opposite water and overfiow chambers B and D, with branches 'B D, and having the central combining-tube, E, connected to the shell bythe partition E', whereby the chambers B and D are separated from each other, as set forth.

IOO

2. The combination of the easing A, having ehmnber, thediseha-rgepassage ofwhieh forms the combining-tube E, Water-Chamber B, Oven a nena contrada, or ujutage, :ls seb forth. HOW-chamber D, and Opposite end seats, a a, Intestmonywhereofhave signed mynmne with the steam and forcing cones F :1nd G, to this specification in the presence oltwo subadapted to said seats a, :md having flanges d serbing witnesses.

:md threaded projeetionsf, andwththe hanged I JAMES DIUELOVV, nuts J, whereby said cones are secured t0 J[he opposite ends ofthe easing A, as seb forth.

3. An injector having' :L valveless overow- \Vitnesses:

HARRY DRURY, HARRY SMITH. 

